Overview
The AD604AR-REEL, produced by Analog Devices Inc., is an ultralow noise, very accurate, dual-channel, linear-in-dB variable gain amplifier (VGA). This component is optimized for time-based variable gain control, particularly in ultrasound applications, but it also supports any application requiring low noise, wide bandwidth, and variable gain control. Each channel of the AD604 provides a 300 kΩ input resistance and unipolar gain control, making it user-friendly. The device utilizes a high-performance preamplifier with an input-referred noise voltage of 0.8 nV/√Hz and features a differential input exponential amplifier (DSX-AMP) architecture.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Resistance | 300 kΩ | |
| Input-Referred Noise Voltage | 0.8 nV/√Hz | |
| Gain Range per Channel | 0 dB to 48 dB, 6 dB to 54 dB | |
| Gain Scaling Factor | Up to 40 dB/V | |
| Bandwidth | 40 MHz (–3 dB) | |
| Slew Rate | 170 V/µs | |
| Supply Voltage | ±5 V | |
| Operating Temperature Range | –40°C to +85°C | |
| Package Type | 24-SOIC (Surface Mount) | |
| Power Dissipation | 220 mW per channel | |
| Quiescent Supply Current | 32-36 mA (VPOS), –15 to –12 mA (VNEG) |
Key Features
- Ultralow noise with an input-referred noise voltage of 0.8 nV/√Hz.
- Very accurate linear-in-dB response achieved with the differential input exponential amplifier (DSX-AMP) architecture.
- Variable attenuator of 0 dB to 48.36 dB followed by a high-speed fixed-gain amplifier.
- 7-stage R-1.5R ladder network for precise gain control.
- User-determined gain ranges, gain scaling (dB/V), and dc level shifting of output.
- Unipolar gain control for ease of use.
- Access to the output of the preamplifier for external filtering.
- Power shutdown at the lower end of the gain control range.
- Ability to drive ADCs directly.
Applications
- Ultrasound and sonar applications, particularly for time-gain control.
- High-performance Automatic Gain Control (AGC) systems.
- Signal measurement systems requiring low noise and wide bandwidth.
- Medical ultrasound systems, such as driving the AD9050, a 10-Bit, 40 MSPS ADC.
Q & A
- What is the primary application of the AD604AR-REEL?
The AD604AR-REEL is primarily optimized for time-based variable gain control in ultrasound applications.
- What is the input-referred noise voltage of the AD604AR-REEL?
The input-referred noise voltage is 0.8 nV/√Hz.
- What is the gain range per channel of the AD604AR-REEL?
The gain range per channel is from 0 dB to 48 dB and from 6 dB to 54 dB.
- What is the bandwidth of the AD604AR-REEL?
The bandwidth is 40 MHz (–3 dB).
- What is the slew rate of the AD604AR-REEL?
The slew rate is 170 V/µs.
- What are the supply voltage requirements for the AD604AR-REEL?
The supply voltage is ±5 V.
- What is the operating temperature range of the AD604AR-REEL?
The operating temperature range is –40°C to +85°C.
- What package type is the AD604AR-REEL available in?
The AD604AR-REEL is available in a 24-SOIC (Surface Mount) package.
- Can the AD604AR-REEL drive ADCs directly?
Yes, the AD604AR-REEL can drive ADCs directly.
- How does the AD604AR-REEL achieve its linear-in-dB gain response?
The linear-in-dB gain response is achieved with the differential input exponential amplifier (DSX-AMP) architecture.
